/* CSS Variables & Reset */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent-tf: #844FBA;
    --accent-aws: #FF9900;
    --accent-vault: #15b7b9;
    --accent-github: #60a5fa;
    --border-color: #334155;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    padding: 20px;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
}

/* Header & Banner Styling */
header {
    text-align: center;
    margin-bottom: 40px;
}

.banner-container {
    width: 100%;
    border-radius: 16px;
    overflow: hidden;
    margin-bottom: 25px;
    box-shadow: 0 0 25px rgba(96, 165, 250, 0.15); /* Απαλό glow που ταιριάζει με το banner */
    border: 1px solid var(--border-color);
}

.hero-banner {
    width: 100%;
    height: auto;
    display: block;
    object-fit: cover;
}

.hero-description {
    color: var(--text-muted);
    max-width: 700px;
    margin: 0 auto;
    font-size: 1.1rem;
}

/* Filters Section */
.filters {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.filter-btn {
    background-color: var(--card-bg);
    color: var(--text-main);
    border: 1px solid var(--border-color);
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
}

.filter-btn:hover, .filter-btn.active {
    background-color: var(--text-main);
    color: var(--bg-color);
    border-color: var(--text-main);
    box-shadow: 0 4px 12px rgba(255, 255, 255, 0.1);
}

/* Portfolio Grid */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 25px;
    margin-bottom: 50px;
}

/* Card Styling */
.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 25px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
}

/* Custom Glow/Border per Stack on Hover */
.card[data-tags*="terraform"]:hover { border-color: var(--accent-tf); box-shadow: 0 5px 15px rgba(132, 79, 186, 0.15); }
.card[data-tags*="aws"]:hover { border-color: var(--accent-aws); box-shadow: 0 5px 15px rgba(255, 153, 0, 0.15); }
.card[data-tags*="vault"]:hover { border-color: var(--accent-vault); box-shadow: 0 5px 15px rgba(21, 183, 185, 0.15); }
.card[data-tags*="cicd"]:hover { border-color: var(--accent-github); box-shadow: 0 5px 15px rgba(96, 165, 250, 0.15); }

.card h3 {
    font-size: 1.3rem;
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

.card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 20px;
}

/* Tags */
.tag-container {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tag {
    font-size: 0.75rem;
    text-transform: uppercase;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 6px;
    letter-spacing: 0.05em;
}

.tag.tf { color: var(--accent-tf); background-color: rgba(132, 79, 186, 0.12); }
.tag.aws { color: var(--accent-aws); background-color: rgba(255, 153, 0, 0.12); }
.tag.vault { color: var(--accent-vault); background-color: rgba(21, 183, 185, 0.12); }
.tag.cicd { color: var(--accent-github); background-color: rgba(96, 165, 250, 0.12); }
.tag.packer { color: #f25f5c; background-color: rgba(242, 95, 92, 0.12); }

/* Banner Bottom */
.cicd-banner {
    background: linear-gradient(135deg, #1e293b, #0f172a);
    border: 1px dashed var(--accent-github);
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    margin-top: 40px;
}

.cicd-banner h4 {
    color: var(--accent-github);
    margin-bottom: 8px;
    font-size: 1.1rem;
}

.cicd-banner p {
    font-size: 0.95rem;
    color: var(--text-muted);
}

/* Footer */
footer {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-top: 60px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}